"Add" button for Extra Class Path doesn't work when I want to add Driver:
2020-03-16 14:50:43,901 [AWT-EventQueue-1] ERROR net.sourceforge.squirrel_sql.client.Main - Exception occurred dispatching Event java.awt.event.MouseEvent[MOUSE_RELEASED,(484,342),absolute(932,615),button=1,modifiers=Button1,clickCount=1] on dialog7
java.lang.NullPointerException
at sun.awt.shell.Win32ShellFolder2.access$200(Win32ShellFolder2.java:72)
at sun.awt.shell.Win32ShellFolder2$1.call(Win32ShellFolder2.java:242)
at sun.awt.shell.Win32ShellFolder2$1.call(Win32ShellFolder2.java:237)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at sun.awt.shell.Win32ShellFolderManager2$ComInvoker$3.run(Win32ShellFolderManager2.java:556)
at java.lang.Thread.run(Thread.java:748)
Sorry, I can't reproduce your problem.
The error message looks to me like there was a problem with your Java installation.